Add scale and transform events to sway_output

include/sway/output.h

@@ -12,8 +12,16 @@ struct sway_output {
 	struct sway_container *swayc;
 	struct sway_server *server;
 	struct timespec last_frame;
+
+	struct {
+		struct wl_signal scale;
+		struct wl_signal transform;
+	} events;
+
 	struct wl_listener frame;
 	struct wl_listener resolution;
+	struct wl_listener scale;
+	struct wl_listener transform;
 };
 
 #endif

sway/config/output.c

@@ -112,10 +112,12 @@ void apply_output_config(struct output_config *oc, swayc_t *output) {
 	if (oc && oc->scale > 0) {
 		sway_log(L_DEBUG, "Set %s scale to %d", oc->name, oc->scale);
 		wlr_output_set_scale(wlr_output, oc->scale);
+		wl_signal_emit(&output->sway_output->events.scale, output->sway_output);
 	}
 	if (oc && oc->transform >= 0) {
 		sway_log(L_DEBUG, "Set %s transform to %d", oc->name, oc->transform);
 		wlr_output_transform(wlr_output, oc->transform);
+		wl_signal_emit(&output->sway_output->events.transform, output->sway_output);
 	}
 
 	// Find position for it

sway/desktop/output.c

@@ -98,17 +98,40 @@ static void output_resolution_notify(struct wl_listener *listener, void *data) {
 	arrange_windows(soutput->swayc, -1, -1);
 }
 
+static void output_scale_notify(struct wl_listener *listener, void *data) {
+	struct sway_output *soutput = wl_container_of(
+			listener, soutput, scale);
+	arrange_windows(soutput->swayc, -1, -1);
+}
+
+static void output_transform_notify(struct wl_listener *listener, void *data) {
+	struct sway_output *soutput = wl_container_of(
+			listener, soutput, transform);
+	arrange_windows(soutput->swayc, -1, -1);
+}
+
 void output_add_notify(struct wl_listener *listener, void *data) {
 	struct sway_server *server = wl_container_of(listener, server, output_add);
 	struct wlr_output *wlr_output = data;
 	sway_log(L_DEBUG, "New output %p: %s", wlr_output, wlr_output->name);
 
 	struct sway_output *output = calloc(1, sizeof(struct sway_output));
+	if (!output) {
+		return;
+	}
 	output->wlr_output = wlr_output;
 	output->server = server;
+
+	wl_signal_init(&output->events.scale);
+	wl_signal_init(&output->events.transform);
+
 	output->swayc = new_output(output);
+	if (!output->swayc) {
+		free(output);
+		return;
+	}
 
-	if (wl_list_length(&wlr_output->modes) > 0) {
+	if (!wl_list_empty(&wlr_output->modes)) {
 		struct wlr_output_mode *mode = NULL;
 		mode = wl_container_of((&wlr_output->modes)->prev, mode, link);
 		wlr_output_set_mode(wlr_output, mode);
@@ -116,9 +139,12 @@ void output_add_notify(struct wl_listener *listener, void *data) {
 
 	output->frame.notify = output_frame_notify;
 	wl_signal_add(&wlr_output->events.frame, &output->frame);
-
 	output->resolution.notify = output_resolution_notify;
 	wl_signal_add(&wlr_output->events.resolution, &output->resolution);
+	output->scale.notify = output_scale_notify;
+	wl_signal_add(&output->events.scale, &output->scale);
+	output->transform.notify = output_transform_notify;
+	wl_signal_add(&output->events.transform, &output->transform);
 
 	arrange_windows(output->swayc, -1, -1);
 }